<template>
  <div class="login">
    <el-form
      ref="loginRef"
      :model="loginForm"
      :rules="loginRules"
      class="login-form"
    >
      <h3 class="title">试题管理系统</h3>
      <el-form-item prop="username">
        <el-input
          v-model="loginForm.username"
          type="primary"
          link
          size="large"
          auto-complete="off"
          placeholder="账号"
        >
          <template #prefix
            ><svg-icon icon-class="user" class="el-input__icon input-icon"
          /></template>
        </el-input>
      </el-form-item>
      <el-form-item prop="password">
        <el-input
          v-model="loginForm.password"
          type="password"
          size="large"
          auto-complete="off"
          placeholder="密码"
          @keyup.enter="handleLogin"
        >
          <template #prefix
            ><svg-icon icon-class="password" class="el-input__icon input-icon"
          /></template>
        </el-input>
      </el-form-item>
      <el-checkbox
        v-model="loginForm.rememberMe"
        style="margin: 0px 0px 25px 0px"
        >记住密码</el-checkbox
      >
      <el-form-item style="width: 100%">
        <el-button
          :loading="loading"
          size="large"
          type="primary"
          style="width: 100%"
          @click.prevent="handleLogin"
        >
          <span v-if="!loading">登 录</span>
          <span v-else>登 录 中...</span>
        </el-button>
        <div style="float: right" v-if="register">
          <router-link class="link-type" :to="'/register'"
            >立即注册</router-link
          >
        </div>
      </el-form-item>
    </el-form>
    <!--  底部  -->
    <div class="el-login-footer">
      <span>Copyright © 2011-2023 xx信息科技 All Rights Reserved.</span>
    </div>
  </div>
</template>

<script setup>
import { encrypt } from "@/utils/jsencrypt";
import { generateID } from "@/utils/uuid";
import useUserStore from "@/store/modules/user";
import { useRouter } from "vue-router";
import { getCurrentInstance, ref } from "vue";
import { deviceType } from "@/constant/deviceType";

const userStore = useUserStore();
const router = useRouter();
const { proxy } = getCurrentInstance();

const loginForm = ref({
  username: "",
  password: "",
  rememberMe: false,
  deviceType: deviceType.PC.value,
});

const loginRules = {
  username: [{ required: true, trigger: "blur", message: "请输入您的账号" }],
  password: [{ required: true, trigger: "blur", message: "请输入您的密码" }],
};

const loading = ref(false);
// 注册开关
const register = ref(false);
const redirect = ref(undefined);

const randomPassword = ref("");

function handleLogin() {
  proxy.$refs.loginRef.validate((valid) => {
    if (valid) {
      loading.value = true;
      // 勾选了需要记住密码设置在 cookie 中设置记住用户名和密码
      const form = { ...loginForm.value };
      if (loginForm.value.rememberMe) {
        const cachePassword = localStorage.getItem("password");
        localStorage.setItem("username", loginForm.value.username);
        if (randomPassword.value === loginForm.value.password) {
          // 随机密码与表单内的密码相同，则说明密码没有变更过，直接重新设置缓存
          localStorage.setItem("password", cachePassword);
          form.password = cachePassword;
        } else {
          // 随机密码与表单内的密码不同，则说明密码变更过，需要重新进行加密，然后缓存
          const encryptPassword = encrypt(loginForm.value.password);
          form.password = encryptPassword;
          localStorage.setItem("password", encryptPassword);
        }
        localStorage.setItem(
          "rememberMe",
          JSON.stringify(loginForm.value.rememberMe)
        );
      } else {
        // 否则移除
        localStorage.removeItem("username");
        localStorage.removeItem("password");
        localStorage.removeItem("rememberMe");
        if (randomPassword.value !== loginForm.value.password) {
          form.password = encrypt(loginForm.value.password);
        }
      }
      // 调用action的登录方法
      userStore
        .login(form)
        .then(() => {
          router.push({ path: redirect.value || "/" });
        })
        .catch(() => {
          loading.value = false;
        });
    }
  });
}

function getCache() {
  const username = localStorage.getItem("username");
  let password = localStorage.getItem("password");
  const rememberMe = JSON.parse(localStorage.getItem("rememberMe"));

  // 生成一次随机密码
  randomPassword.value = generateID().substring(0, 16);
  if (password !== null) {
    // 只有在密码有缓存的情况下才将随机密码赋值给表单
    password = randomPassword.value;
  }

  loginForm.value = {
    username: username === null ? loginForm.value.username : username,
    password: password === null ? loginForm.value.password : password,
    rememberMe: rememberMe === null ? false : Boolean(rememberMe),
    deviceType: deviceType.PC.value,
  };
}

getCache();
</script>

<style lang="scss" scoped>
.login {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  background-image: url("../assets/images/login-background.jpg");
  background-size: cover;
}
.title {
  margin: 0px auto 30px auto;
  text-align: center;
  color: #707070;
}

.login-form {
  border-radius: 6px;
  background: #ffffff;
  width: 400px;
  padding: 25px 25px 5px 25px;
  .el-input {
    height: 40px;
    input {
      height: 40px;
    }
  }
  .input-icon {
    height: 39px;
    width: 14px;
    margin-left: 0px;
  }
}
.login-tip {
  font-size: 13px;
  text-align: center;
  color: #bfbfbf;
}
.login-code {
  width: 33%;
  height: 40px;
  float: right;
  img {
    cursor: pointer;
    vertical-align: middle;
  }
}
.el-login-footer {
  height: 40px;
  line-height: 40px;
  position: fixed;
  bottom: 0;
  width: 100%;
  text-align: center;
  color: #fff;
  font-family: Arial;
  font-size: 12px;
  letter-spacing: 1px;
}
.login-code-img {
  height: 40px;
  padding-left: 12px;
}
</style>
